Renal Cortex Flashcards

Examine the renal cortex, including nephron structures, cortical labyrinth, medullary rays, blood supply, and filtration anatomy.

Card 1 of 30Question

What is the renal cortex?

The outer region of renal parenchyma containing renal corpuscles and portions of the nephron tubules.

In This Section

1. What is the renal cortex?

The outer region of renal parenchyma containing renal corpuscles and portions of the nephron tubules.

2. Which structure forms the external boundary of the renal cortex?

The fibrous renal capsule.

3. Which region lies immediately deep to the renal cortex?

The renal medulla.

4. What are the two main histological subdivisions of the renal cortex?

The cortical labyrinth and medullary rays.

5. What is the cortical labyrinth?

Cortical tissue containing renal corpuscles and convoluted tubules between the medullary rays.

6. What are the medullary rays of the renal cortex?

Radially arranged bundles of straight renal tubules and collecting ducts extending into the cortex.

7. Which structures in the renal cortex contain the glomerular capillary tufts?

Renal corpuscles.

8. What two structures form a renal corpuscle?

A glomerulus and its surrounding Bowman's capsule.

9. What is the primary function of the glomerulus in the renal cortex?

Filtration of blood plasma to produce glomerular filtrate.

10. Which three components form the glomerular filtration barrier?

Fenestrated capillary endothelium, glomerular basement membrane, and podocyte slit diaphragms.

11. Which renal tubule segment emerges directly from the urinary pole of a renal corpuscle?

The proximal convoluted tubule.

12. What is the main function of the proximal convoluted tubule?

Bulk reabsorption of filtered water, electrolytes, glucose, and amino acids.

13. Which epithelial specialization is prominent in proximal convoluted tubules?

A dense apical brush border formed by numerous microvilli.

14. How does the distal convoluted tubule differ histologically from the proximal convoluted tubule?

It has fewer apical microvilli and typically a clearer, wider-appearing lumen.

15. Which specialized distal tubular cells form the macula densa?

Closely packed epithelial cells near the vascular pole of the renal corpuscle.

16. What structures constitute the juxtaglomerular apparatus?

The macula densa, juxtaglomerular granular cells, and extraglomerular mesangial cells.

17. Which cells of the juxtaglomerular apparatus secrete renin?

Modified smooth muscle cells, called granular cells, mainly in the afferent arteriole.

18. Which arteries run along the corticomedullary junction?

The arcuate arteries.

19. Which arteries extend outward from the arcuate arteries into the renal cortex?

Cortical radiate arteries, also called interlobular arteries.

20. Which vessels directly supply blood to the glomerular capillaries?

Afferent arterioles.

21. Which vessels carry blood away from the glomerulus?

Efferent arterioles.

22. What capillary network surrounds most cortical renal tubules?

The peritubular capillary network.

23. What distinguishes cortical nephrons from juxtamedullary nephrons?

Cortical nephrons generally have shorter nephron loops, while juxtamedullary nephrons have long loops extending deep into the medulla.

24. Where are the renal corpuscles of juxtamedullary nephrons located?

In the deep renal cortex near the corticomedullary junction.

25. What are renal columns in relation to the renal cortex?

Extensions of cortical tissue between adjacent renal pyramids.

26. What structures define a renal cortical lobule?

A central medullary ray and its surrounding cortical labyrinth, bounded approximately by cortical radiate vessels.

27. Why does the renal cortex appear granular on gross examination?

Because of its numerous renal corpuscles and convoluted tubules.

28. What does reduced renal cortical thickness commonly indicate on imaging?

Loss of renal parenchyma, often associated with chronic kidney disease or scarring.

29. Why is the renal cortex particularly vulnerable to ischemic injury?

Its tubular epithelial cells have high metabolic demands and depend on adequate oxygen delivery.

30. What is renal cortical necrosis?

Ischemic destruction of cortical renal tissue, usually resulting from severe impairment of renal perfusion.